Safety steam-boiler



2' Sheets-Sheet l.,

(No Model.)

G. T. FILLING-S.

SAFETY STEAM BOILBR.

2. A fr ou! D D w N DE w W; mr D N/Ml m N. PETERS. PhuloLlMmpMr. Wuhingtnn. D. CA

2 Smets-sheet 2.

(No Model.)

G. 'I'. PILLINGS.

SAFETY STEAM BOILER.

No. 269,458. Patented Deo. 19, 1882;

I- I'E IUI*- l- IIEL 1V"- UNITED STATES.

PATENT OEEIcE.,

GEORGE T. PILLINGS, OF BALTIMORE, MARYLAND.

SAFETY STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 269,458, dated December 19, 1882.

Application filed September 11, 188:2. (Xo model.)

To all whom it may concern.:

Beit known that I, GEORGE T. PILLINGs, of the city of Baltimore and State of Maryland, have invented certain Improvements in Safety SteamBoilers, of which the following is the specification.

This invention relates to a boiler having practically a vertical cylindrical shell of annular cross-section-that is to say, the shell is composed ot' two wrough t-iron sheets-an outer and an inner one-separated byrings, to which the said sheets are riveted to form awater and steam space. The boiler is open at its upper end, and the central cylindrical space above that portion thereof which is used as a furnace is provided with a series of heaters consisting of tubes properly connected, which are in communication at the bottom with the Water in the boiler and at their upper end lled with steam.

ln the turther. description ot' my invention which follows reference is made to the accompanying.,r drawings, forming a part hereof', and in which Figures I and II are vertical sections ofthe improved boiler as seen from dit'ereut points of view. Figs. III and lVare respectivelya top view of the boiler proper and a section taken 'on the dotted line 00 y, Fig. I.

Similar letters of reference indicate similar parts in allrthe views.

A is the shell of the boiler, consistingof the outer and the inner wroughtir'on sheets, re-' spectively represented by a and b, and the upper and lower separating-rings, c and d. The separating-rings are ofthe kind commonly used in vertical boilers to form a leg around the furnace; but the inner sheet, b, may be tianged ont and riveted to the outer sheet, a, if such construction is preferred. It will be seen that the inner sheet, b, extends to the top of the boiler, which is open at that point. Oonsequently the products of combustion from the lower part of the boiler, whicl1.is used as a furnace, have free access, except where interto the hood B, and thence to the smoke pipe or stack C.

D D are wrought-iron tubes, secured at their lower ends to heaters E, which may be made from cast or malleable iron or steel. The heaters E are varied in shape to suit the locationv vin which they are placed; but they all correfered with by the heaters hereinafter described, l l

steam escapes to the drum without passing through a large body of water, as in ordinary boilers. The boiler is provided with a base and with grate-hars of ordinary description.

It will be understood thatthe annular shape of the boiler-shell gives greater strength than can he obtained in any other form.

I do not limit myself to the construction ot' the boiler-shell ot' a cylindrical form, as other shapes may be used and the annular design preserved. p

I claim as my invention- A practically upright boiler, which consists of a shell composed ot' two wrought-iron sheets connected at their ends by separating-rings and rivets, inclosing a system of tubes con nected at their lower end to the water-space ot' the boiler, separatelyor in groups, by means ot' suitable heaters, and at their upper end to a steam-drum at a point above tl1e=waterline, substantially as specified.

GEORGE T. PILLINGS.

Witnesses:

ED. J. Drees, WM. T. HOWARD. 

